package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class GenericDemo {
    public static void main(String[] args) {
        Collection<Point> c = new ArrayList<>();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        Iterator<Point> it = c.iterator();
        while (it.hasNext()){
            Point p =it.next();
            System.out.println(p);
        }
        for (Point p:c){
            System.out.println(p);
        }

        /*
        Collection<String> c = new ArrayList<>();
        c.add("one");
        c.add("123");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        c.add("44");
        //迭代器所指定的泛型应当与其遍历的集合的泛型一致
        Iterator<String> it =c.iterator();
        while (it.hasNext()){
            String str =it.next();
            System.out.println(str);
        }
        for (String str:c){
            System.out.println(str);
        }

         */
    }
}
